Stimulate Contract: Caffeine is a substance found in coffee and tea and now in various drinks or supplements. Caffeine is a stimulant, meaning it causes certain organs of the body to become active. You may have noticed that you are more awake after drinking coffee. So your brain is more active or stimulated. Caffeine stimulates the bladder to contract and may cause stimulation of GI tract causing nausea.
Answered 6/10/2014
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